When people have no forces to support their weight, such as astronauts in space, they can feel the sensation of .

Why do astronauts float in space?Group of answer choicesThey are in a constant state of free-fallThere is no gravity in space.They don't float in space.Their weight is zero so they float.

5.  If all objects have gravitational force between them, why wouldn't you feel the force of gravitation between your chair and your body?

The effects of gravity are effectively negated if an object is in free fall.  For example, an object orbiting the Earth experiences an apparent weightlessness known as microgravity.  Because the human body evolved under the influence of Earth's gravity, human physiology undergoes several changes in microgravity environments.  Puffy face syndrome (PFS) occurs when an astronaut's extracellular fluid shifts toward upper body regions, resulting in facial bulging and leg shrinkage.  Elongation of the spinal column also occurs as intervertebral discs (spinal cartilage) decompress, making astronauts up to 6 cm taller.Researchers simulated microgravity-induced spinal elongation on Earth by suspending 50 volunteers by the arms, holding each above the ground in an upright position.  The thickness of each intervertebral disc was measured prior to and following 10 minutes of suspension.  Researchers then compared the percentage change in intervertebral disc thickness to similar measurements recorded in microgravity, as shown in Figure 1.Figure 1  Percentage change in intervertebral disc thicknessIn theory, spinal elongation would also occur in reduced-gravity environments like the surface of the Moon, where the acceleration of gravity is one-sixth that observed on the Earth's surface. Question 45Ignoring any attachments between the spinal discs and vertebrae, how would the maximum force of static friction between these anatomical structures compare for a person standing on the surface of the Moon to a person standing on the surface of the Earth?A.It would be 6 times as great.B.It would be approximately equal.C.It would be 1/6 as great.D.It would be 0.

NASA astronauts in space exercised as part of their daily routine, yet they still had problems with bone weakness after prolonged stays in space. Why did this happen?

True or false: When an astronaut is weightless in orbit around Earth, the force of gravity acting on the astronaut is zero.True false question.TrueFalse